Means for heating or cooling fluids.



O. A. PARSONS, S. S. COOK & L. M. DOUGLAS. MEANS FOR HEATING OR COOLINGFLUIDS.

APPLIOATIQN FILED mums. 1912.

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UNITED s'rATEs PATENT OFFICE.

COOK AND LOUIS MORTIMER DOUGLAS, OF WALLSEND, ENGLAND; SAID COOK ANDDOUGLAS ASSIGNORS TO SAID PARSONS. I

MEANS FOR HEATING OR COOLING FLUIDS.

Specification of Letters Patent.

Application filed June 25, 1912. Serial No. 705,874.

To all whom it may concern:

Be it known that we, CHARLES ALGERNON PARSONS, K. C. B., a subject ofthe King of Great Britain and Ireland, and residing at Heaton \Vorks,Newcastle-upon-Tyne, in the county of Northumberland, England, andSTANLEY SMITH (1001; and Lows MORTI- MER DOUGLAS, subjects of the Kingof Great Britain and Ireland, and residing at Turl inia lVorks,VVallsend-upon-Tyne, in the county of Northumberland, England, haveinvented certain new and useful Improvements in and Relating to Meansfor the Heating or Cooling of Fluids, of which the following is aspecification.

This invention relates to means for transmitting heat between fluidsand-relates par-- ticularly to oil or like coolers of 'the type in whichthe oil'is passed through a tube surrounded by a heat absorbing fluid.It is well known that in such apparatus the rate of heat transmission isgreatly increased by restricting the passage for the flow of fluidthrough the tube by means of a core of irregular form which acts tochange frequently the direction of flow and which, when made of goodheat conducting material, further facilitates the heat transmission.

The object of the present invention is to effect further improvements insuch means.

The invention consists in heat transmis sion means of the above typeinwhich the core inserted Within each of the tubes is formed at intervalsalong its length with flats whichare situated iii-central planes of thetube and have their edges contacting with said tube.

The invention also consists in the heataccording to the presentinvention. Figs. 2

and v3 are transverse sections on the lines A-A and BB of Fig. 1respectively, while Figs. 4 and 5 are similar transverse sections of aslightly modified form of the device. I

'One method of carrying the invention into effect is described asappliedto apparatus for cooling oil which has been used,

The oil is passed through one or more tubes suitably arranged usuallywithin a vessel containing liquid or fluid maintained at a much lowertemperaturethan the oil and thus acting as a heat absorbing medium,while each tube contains a core for the purpose of increasing the rateof heat transmission. A convenient form'of such a core, a accordingto'the present invention is shown in Figs. 1, 2, and 3, and is readilymade by crushing or flattening a metal tube of ductile material atsuitable intervals along its length in such a manner that the alternateflats, b, thus produced are at right angles to the intervening flats, 0,and, as nearly as possible, lie in central planes, l, d, and e, 6,containing the axis, f, f, of the tube 9, into which tube the core isinserted. The inner walls'of the crushed tube in some cases touch oneanother while as shown in Figs. 2 and 3, the crushed tubes themselvesare usually closed at both ends as it is not intended to pass fluidthrough the core itself.

It will be seen that by forming the core from a tube having a suitablediameter less than that of the tube, g, through which the oil passes,each of the flats, b and 0, can

be formed so that the edges touch the inner walls of the surroundingtube, 9, such contact being made certain preferably by drawing the corethrough a die or opening of substantially the same dimensions 'as theinner wall of the surrounding tube. When the core, a, thus formed ismade of a good heat conducting material, it will be provide anadditional cooling surface for the oil, and considerably improve thetransmission of heat from the oil to the walls of the tube containingthe'core.

Although in all cases the flats, b and c, of

Patented Apr. 15, 1913..

the core lie in planes,-d, d and e, e, passing substantially through theaxis, f, f, of the tube, adjacent flats, b and a, need not be 1n twoplanes at right angles to one another. That is, the planes at d and e,6, maybe 111'- clined at an angle to one another. F urther, each pair ofadjacent flats, b and 'c vmay be inclined at any angle to oneanother,'-tii1d' to a central plane of the tube, 9 this latter anglevarying along the length of the core whereby the coreor retarder thusproduced acts even more efiiciently to break up the flow of oil throughthe tube and thus to improve the heat transmission.

In many cases instead of forming the core from a tube the core maybe'cast 1n the required shape or, as shown in transverse section inFigs. 4 and 5, may be formed by sion means according to the presentinven-' tion may be used either for cooling or heating the fluid whichis passing through a tube and has its direction of flow frequentlychanged by .the action of the core. The fluid which is outside the saidtube and absorbs from or gives up heat to the fluid flowing through thetube, may be gas or liquid inclosed or circulated within a suitablevessel containing the tubes as desired.

I-lcat transmitting means of this type are exceedingly eflicient, andare applicable to coolers, heaters, condensers, and similar ap paratusin which there is a transmission of heat between two fluids, one ofthese fluids being passed through a tube which contains acore of theabove type and is surrounded by the other fluid. Moreover such meansconstructed according to the present inven-' tion are inexpensive andeasily manufac' tured, while obviously many modifications can be made inthe details of such means in order to meet the particular requirements.

Having now described our invention what we claim as new and desire tosecure by Letters Patent is 1. A device for transmitting heat betweentwo fluids, comprising in combination a tube through which one of thefluids is passed,'a core inserted in said tube, said core having flatswhich are situated in planes containing the axis of the tube and whichcontact with the surrounding walls of said tube along linessubstantially parallel to the axis thereof.

2. A device for transmitting heat between two fluids, comprising incombination a tube through which one of the fluids is passed, a coreinserted in said tube, said core being made by crushing a tube atintervals along its length to form flats which contact with thesurrounding tube and are situated in planes containing the axis of thelatter, adjacentflats being in ditt'erent planes, whereby the surfacesconnecting the flats deflect the fluid on to the walls of thesurrounding tube and thereby improve the heat transmission.

3. A device for transmitting heat between two fluids, comprising incombination a tube through which one of the fluids is passed, a coreinserted in said tube, said core being made by crushing a tube atintervals along its length to form flats which contain the axis of thesurrmmding tube and contact with the latter along lines substantiallyparallel with the axis thereof, adjacent flats be ing in differentplanes whereby the surfaces connecting the flats deflect the fluid on tothe walls of the surrounding tube and thereby improve the hcattransmission.

t. A. device for transmitting heat between two fluids, comprising incombination a tube through which one of the fluids is passed, a coreinserted in said tube, said core being made by crushing a tube atintervals along its length to form flats which contain the axis of thesurrounding tube and contact with the latter along lines substantiallyparallel with the. axis thereof. adjacent, flats being in planes atright angles to one another, and being connected by surfaces whichdefleet the fluid on to the walls of the surrounding tube and therebyimprove the heat transmission.

In testimony whereof, we aflix our signatures in presence of twowitnesses.

CHARLES ALGERNON PARSONS. STANLEY SLlll'lll COOK. LOUIS MORTIMERDOUGh/tS.

Witnesses:

FREDERICK. GORDON HAY Pnnrom), ALnnnT W. PAnn.

